Other Chemistry Answers

If 3.6 grams of C react, how many moles of CS₂ will be produced?

An isotope of caesium (caesium-137) has a half-life of 30 years. If 1.0 g of caesium-137 disintegrates over a period of 90 years, how many g of caesium- 137 would remain?

Determine the limiting reactant when 4.2 mol Fe(OH)3 reacts with 6.5 mol H2SO4 in the following reaction.


2 Fe(OH)3 + 3 H2SO4 --> Fe2(SO4)3 + 6 H2O

Determine the limiting reactant when 4.2 mol Fe(OH)3 reacts with 6.5 mol H2SO4 in the following reaction.


2 Fe(OH)3 + 3 H2SO4 --> Fe2(SO4)3 + 6 H2O

1. calculate the number of moles of sodium carbonate present in 100cm³ of 2M solution

2.calculate the mass of sulphuric (iv)acid in 250cm3 of solution whose concentration is 0.25mole dm³

3. Calculate the number of moles present in 25cm³ of a 0.2M sodium hydroxide solution

Mass in grams present in 25cm³ of a 0.2M sodium hyroxide solution

4.calculate the number of moles of sodium chloride in 500cm³ of 3M sodium chloride solution

5.calculate the mass of calcium chloride required to make one litre of 0.2M calcium chloride

6.when 34.8g of potassium sulphate were dissolved in 500cm³ distilled water.calc a)the concentration of potassium sulphate b) molarity of the solution

A saturated solution of salt x contains 0.28g of the salt in 100cm³ of solution at 25 degrees Celsius what is the solubility of the salt x at this temperature (relative molecular mass of x = 56)

when 1 mole of barium sulfate was dissolved in water it resulted to a H of 0.52 KJ/mol. How much heat is absorbed when 450g if the compound is dissolved in water has zero effect

For the following nucleotides, identify the components and whether the nucleotide is found in DNA only, RNA only, or both DNA and RNA:

a.deoxyguanosine-5'- monophosphate (dGMP) b.adenosine-5'-monophosphate (AMP)

1. One type of kidney stones is formed by the precipitation of calcium phosphate (Ca3(PO4)2), which has a Ksp of

1.3 x 10-32 at 25 C. A patient submitted a urine sample which contained concentrations of 1.2 x 10-4 mol dm-3 calcium

ions and 1.1 x 10-8 mol dm-3 phosphate ions.

(a) Write a balanced equation for the formation of calcium and phosphate ions from calcium phosphate.


(b) Write the expression for the solubility product constant for calcium phosphate.


(c) Calculate the ionic product of calcium phosphate in the patient's urine.


(d) State why kidney stones are likely to form in the patient's urine.

Determine pH of a weak base that has Kb = 3.78 x10-18